Oracle PL/SQL/Object Oriented Database/Value Function

VALUE function for object

SQL> CREATE OR REPLACE TYPE address_obj as OBJECT(
  2        street VARCHAR2(20),
  3        city VARCHAR2(20),
  4        state CHAR(2),
  5        zip CHAR(5));
  6  /
Type created.
SQL>
SQL> CREATE TABLE address_table OF ADDRESS_OBJ;
Table created.
SQL>
SQL>  INSERT INTO address_table VALUES (ADDRESS_OBJ("1 A St.","Mobile","AL","36608"));
1 row created.
SQL>
SQL> CREATE TABLE client (name VARCHAR2(20),
  2    address REF address_obj scope is address_table);
Table created.
SQL>
SQL> INSERT INTO client SELECT "Walsh", REF(aa) FROM address_table aa;
1 row created.
SQL>

SQL>
SQL> -- Address_table (which contains row objects) using the VALUE function:
SQL>
SQL> SELECT VALUE(aa)
  2  FROM address_table aa;
VALUE(AA)(STREET, CITY, STATE, ZIP)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
ADDRESS_OBJ("1 A St.", "Mobile", "AL", "36608")
SQL>
SQL>
SQL>
SQL>
SQL>
SQL> drop table client;
Table dropped.
SQL>
SQL> drop table address_table;
Table dropped.
SQL>
SQL>
SQL>